I need help with this slope problem please!

Which expression is not a polynomial?

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?

Line segment eg is partitioned by point f in the ratio 1: 1. point e is at e (0, 4), and point f is at (1, 3). what are the coordinates of point g? (−1, 5) (2, 2) (3, 1) (4, 0)